The STT-15 is a semi-automatic AR pistol in 5.56 NATO with a 10.5" barrel and a 30-round capacity. Its San Tan barrel is machined from 41V50 vanadium steel with a 1:7 twist, threaded ½-28 for muzzle devices and dimpled so the gas block stays aligned and held in place. The upper is cut from a single piece of 7075T6 aluminum, and the bore, receiver extension face and barrel nut threads are machined in one operation so they sit concentric and square to the barrel assembly. The bolt carrier group is made of 9310 steel, case hardened, then magnetic particle tested and proof tested at 70000 psi, and its three gas ports bleed off the extra gas a suppressor sends back.

A CMC single-stage flat bow drop-in trigger with a 3.5 lb rating gives you a straightforward one-stage pull. The lower is fully ambidextrous with three QD attachment points, and the charging handle, magazine release and bolt release are all ambidextrous, so the controls work from either hand. A Midwest Industries rail provides a full-length Picatinny top with M-LOK slots all around and two more QD sling points, while a Magpul MOE grip and pistol brace ride on a 6-position MIL-spec buffer tube with an H1 buffer. The receivers are CNC machined from billet 7075-T6 aluminum with extended feed ramps and finished in Type III, Class 2 hardcoat anodized Olive Drab Green.

• Brand: San Tan Tactical
• Model: STT-15
• Caliber: 5.56 NATO
• Barrel Length: 10.5", 1:7 twist, 41V50 vanadium steel
• Capacity: 30 Rds
• Action: Semi-automatic
• Trigger: CMC 3.5 lb single-stage flat bow
• Finish: Type III, Class 2 hardcoat anodized, Olive Drab Green